All optical NOR and NAND gate based on nonlinear photonic crystal ring resonators Alipour-Banaei, Hamed ; Serajmohammadi, Somaye ; Mehdizadeh, Farhad Abstract Publication: Optik Pub Date: October 2014 DOI: 10.1016/j.ijleo.2014.06.013 Bibcode: 2014Optik.125.5701A